Lock



July 20 1926.

1,593,076 (3. HOFFMAN LOCK Filed Sept. 22. 1923 2 Sheets Sheet 1 July 20,1926, 1,593,076

c. HOFFMAN LOCK Filed Sept. 22. 1923 2 Sheets-Sheet 2 5mm 1 will Patented duty 20, 1926.

TJNETED STATES CARL HOFFMAN, F ALLENTQQVN, PENNSYLVANIA, ASSIG-NOR T0 PAULINE HOFF- MAN, 01 ALLENTOWN, PENNSYLVANIA.

LOCK.

Application filed September 22, 1923.

My invention relates more especially to a trip-operated lock, and the object of my invention is to provide a simple and highly eliicient lock in which the lock-bolt is securely held from movement in either of its positions in which the lock is operable from inside and outside the door to initially release the bolt before shifting the same; and in which the lock-bolt is released to move to its operative position by a trip device which itself functions during closing movement of the door.

In the drawings, Figure 1 is a face view, the casing cover being removed, showing the improved. lock with its lock-bolt retracted. Figure 2 is a similar view with the lock-bolt projected. Figure 3 is a horizontal sectional view of the lock on line 33 of Figure 1. Figure 1 is a vertical, transverse sectional view on line 1- 1 of Figure 1. Figure 5 is a detailed perspective view of the lock-bolt. Figure (5 is a fragmentary perspective view showing the bolt-engaging end of the spindle. Figure 7 is a perspective view of the trip bar.

In the casing 1 is mounted the lock-bolt 2 which is centrally reduced to thereby provide relatively enlarged inner and outer ends, the outer end constituting the keeperengaging end. The centrally reduced portion of the bolt which is laterally offset, is formed with a lengthwise slot 3 to receive the supporting guide pin 4. A leaf spring 5, mounted on a fixed pin 6 within the casing, bears against the shoulder 7 at the juncture of the reduced central portion of the keeperengaging end of the lock bolt for tensioning the latter and normally urging the same to its operative position. The bolt may be locked in either operative or inoperative position by a manually set pin 8 selectively engageable with the shoulders 9 and 10 of the bolt, said pin being frictionallv adjust able in a vertical slot 11 of the casing.

The enlarged inner end of the bolt is formed on its upper outer edge portion with a recess or pocket 12 for receiving the lug 13 which is under the control of the house key from the exterior of the door. Extending inwardly from the inner enlargement of the bolt is a fixed pin 14 which is loosely straddled by a forked lug 15 depending radially from a knob-operated spindle 16 leading tothe inner side of the door. The lower edge Serial No. 664,179.

of the inner end of the bolt is formed with a pair of spaced shoulders 1? and 18 to be engaged selectively by an upstanding proection 19 on the lower arm of a horizon tally disposed U-shapcd member 20, said arm having a terminal eye 21 pivot-ally mounting I he U-meinber on the pin 22 of the casing.

A leaf spring 23 is fixed to the under side of the lower arm and bears against the adjacent wall of the casing for urging the U- member upwardly about its pivotal mounting to engage the projection 19 with a selected one of the shoulders 17, 18. A marginal flange 24 extends up from said lower arm and along side the said enlarged inner end of the bolt to be engaged and depressed by the key actuated lug 13 for re leasing the bolt from the locking projection 19 during the initial movement of the lug whereby the bolt may be retracted upon further rotary movement of said lug. This flange, furthermore serves to guide the U- member in its vertical swinging movement; also the lock bolt in its sliding movement on the guide pin 4c, it being further emphasized in this connection that said flange functions to prevent outward movement of the bolt and consequent dislodgment of the pin 4: from slot 3.

As a means for effecting trip release of the bolt from the U-member, the latter has its upper arm terminating in an upwardly curved portion 25 which extends into the path of a trip device including a slide bar 26 having a double-beveled nose projecting from the casing so as to engage an abutment in the form of a beveled face 27 on the keeper 28. Obviously, as the noserides on the face 27 the slide bar will move inwardly into the casing. A projection 29 on the casing wall guidingly supports the inner end of the slide bar which latter has a standard 30 supporting an overhanging and horizontal guide rod 31 whose free end slidably passes through an apertured guide car 32 between which and said standard is compressed a coiled spring 33. A nut 34, threaded on the extreme end of rod 31 abuts the guide car 32 to limit the forward projection of the s ide trip-bar by the coiled spring 33. A depending ledge 36 from the Slide-bar serves as a support for a hinged trip 37, a back plate 38, and a spring 39, the latter yieldingly holding the hinged trip-against its back plate 38 which prevents the trip from swinging tliei'ebeyond. This arrangement of the several. parts is such that iiiward sliding of the tripbar will cause the trip 37 to engage the upturned portion of the U-meniber, to rock the latter for dis-in gaging the locking projection 19 from shoulder 17 and thereby permit the lock-bolt to move to its operative position as influenced by the spring 5.

In actual practice, and assuming that the door is shut, the several parts will be related as depicted in Figure 2. To unlock the door 'fl'Ollltllc outside, the key-controlled lug 13 (see Figure-3) is turned down into therec-ess 12 first engaging the flange 2% to eil ect a release of the bolt from the locking projection 19, and finally sliding the bolt inwardly against the tension of spring 5. As the bolt approaches its inner limit of movement the lug l3 begins upward ai'cuate travel which permits the projection 19to riseand engage shoulder 17 for locking the bolt. retracted. Should the door be op x. from within by rotating the spindle 15, the torkl?) will pull backwardly on the pin 1 lpreliminary to which the locking projection l9'inust be disengaged from the bolt. For thisreason a lug 35 extends radially from the spindle 16 adjacent the fork whose function is to engage the up]. er arm of the" U-in-eiiiber and depress it against the spring 23. This lug is designed to release pressure from the Unnember in sufficient the to permit the locking projection to ascend and enshoulder 17. It will also be noted that by reason of the relative sizes of the fork 15 and pin 14-, the former may move in either direction a limited extent suilicient to per-- init the lug 85 functioning. After the lockbolt is fully retracted, the door may then be opened, the trip-bar merely idling on its inward movement as the double-beveled nose cams against and rides over the edge of the keeper, it being understood that the bolt retract-mg" means will not be released until after the trip-bar has passed over the keeper. Thus, the lock-bolt will be held retracted whilethe door is in opened position.

Upon closing the] door, the trip bar will ride inwardly over the keeper and cause the trip STto engagetheupturned terminal and etlect a swinging of the U-member about its pivot 22 which disengages the projection 19 from shoulder 17 and permits the tensioned bolt 'to slide forwardly into the keeper. The action securely locks trio-door without further manipulation or the use of a key. As the bolt is projected. the pin is will return'the fork to the position of Figure 2, rotating its spindle and the knob therewith, or in the direction indicated by the arrow in Figure 1. lVhen the manually set pin 8 is engaged with bOltSllOlllClQl 10 the bolt 2 will be held retracted and slide for preventing lateral displacement and for guiding the bolt and means.

2. In a look, a lock-bolt, manual means-for retracting the same, means for holding the bolt retracted, a trip device adapted te'be actuated upon engagement with an abutment to release the bolt from the second means, and a member carried by said first mentioned means effective at all positions thereof for slidingly retainingsaid bolt'in said lock.

3. In a lock, 'a lock-bolt, means for retracting the same, means ll'lClQPBll-Cl-Gllt"0f said retracting means for holding the bolt retracted, a movablymounted trip'bar, and

a trip yieldably carried by the bar"to"en-" gage the second means for rendering it inoperative in one direction of movement of the bar and yieldable past the said'second means in the opposite movement/of thebar.

4. In a look, a bolt, an actuatin means" therefor, means independent of said actuating means for holding the bolt retracted, a slidably' mounted and tensioned tripbar,

a trip mounted on the bar for renderingthe bolt-holding means inoperative upon move ment of the bar from normal position" and for yielding past said means upon there turn movementoi the bar, and a spring for holding the trip to'engag'e said'means.

5. In a lock, a bolt havinga shoulder,

means movably mounted to engage the" shoulder to hold the bolt against movement, automatically depressible means to disengage the first means from the shoulder to release the bolt,- manual bolt-operating 7. In a lock, a bolt, means for shitting the-same, a spring pressed bolt-locking mem-- ber engageable with the bolt to hold the I same against movement, and having a flange depressed thereby for effecting release of the bolt, a second means for shifting the bolt, an extension on the locking member with which the second means is engageable to depress said member and trip-actuated means for engaging the extension to depress said member.

8. In a look a tensioned bolt, a plurality of bolt actuators each having a lug for shifting the bolt, a spring-pressed bolt locking member pivotally mounted for movement toward and from a bolt-engaging position, said member being engageable by said lugs for being rendered inoperative, and a trip device movable to engage the locking member for moving it to inoperative position.

9. In a look, a lock bolt, manual means for retracting the same, means for holding the bolt retracted, a trip device to be actuated upon engagement with an abutment to release the bolt from the second means, and a manually operable member engageable With said bolt to hold same retracted upon release thereof from said second mentioned means by the action of said trip member.

10. In a lock, a lock bolt, manual means for retracting the same, means for holding the bolt retracted, a striker plate actuated trip device automatically operable in the closing movement of the door to release the bolt from the second means, and a manually operable member engageable with said bolt to hold same retracted upon release thereof from said second mentioned means by the action of said trip member.

11. In a look, a lock-bolt, means for retracting the same, means independent of said re tracting means for holding the bolt retracted, a movably mounted trip bar, a trip yieldably carried by the bar to engage the second means for rendering it inoperative in one direction of movement of the opposite movement of the bar, and a manually operable member engageable with said bolt to hold same retracted upon release thereof from said second mentioned means by the action of said trip bar.

In testimony whereof I have signed this specification.

CARL HOFFMAN. 

